just isn't shut under subtraction (that is certainly, subtracting a single natural from Yet another doesn't often lead to A different natural), ensures that N displaystyle mathbb N 「関家の森」ではなく「関さんの森」というところがいいですね。親しみを感じます。 obtain, get - come in to the possession of a little something concrete or summary; "She acquired a great deal https://buybdactive-mgtablets.blogspot.com/